Steam-generating grate-bar



(No Model.)

W. H'. PARRIS.

STEAM GB-NBRATING GRATE BAR..

Patented Oct. 28

INVENTOR JttoT'r-Ley. A l

bars.

UNITED STATES PATENT GEEICE.

WILLIAM H. FARRIS, OF DETROIT, MICHIGAN.

STEAM-GENERATING GRATE-BAR.

SPECIFICATION forming part of Letters Patent No. 439,131, dated October 28, 1890.

Application filed March 8, 1890. Serial No. 343,189. (No model.)

To all whom it may concern.-

Be it known that I, WILLIAM H. FARErs, a citizen of the United States, residing atDetroit, in the county of Wayne and State of Michigan, have invented certain new and useful Improvements in Steam-Generating Grate-Bars; and I do declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to the letters of reference marked thereon, which form a part of this specification.

This invention relates to certain new and usefulv improvements in steam generating grate-bars for boilers, and relates more particularly to the arrangement of coupling the hollow grate-bars, bridge-wall, and side bars so as to form a communication between said parts through which the water and steam may circulate,which will be more fully hereinafter set forth, and the essential features of the device pointed out particularly in the claims.

In the accompanying drawings, forming a part of the specification, Figure 1 is a perspective view of one half of the grate. The other half, being of the same construction, is not shown. Fig. 2 is a longitudinal section on dotted line 1 1 of Fig. 1. Fig. 3 is an inverted plan of the lower side bar and one of the grate- Fig. 4 is a longitudinal section through the side bars, taken on dotted line a: x of Fig. 1. Fig, 5 is an enlarged view of the coupling used in forming a water-tight joint between the parts.

Referring to the letters of reference, A indicates the grate-bars, C the vertical columns or risers, and D the horizontal pipe coupled thelreto, which latter parts form the bridgewa l.

B B B indicate the side bars of the grate.

The grate-bars A are coupled by the cross or mud pipe E, that crosses the under face of said bars transversely near their forward end', and is coupled to the depending head F of said bars by means of the nipple H and tiebolt n, as clearlyshown in Figs. 1 and 2. The rear end of each of the grate-bars A is coupled to the base of one of the vertical columns C, the joint between said parts being formed by the nipple H and tie-bolt h, the inner end of said tie-bolt having a T-shaped head a ,that is passed through the nipple H and through the slotted lug a in the interior of the column G, when said bolt is turned,`causing the head a thereof to engage with the lug a. on

each side, thus locking said head therein. The outer end of said bolt extends through the nose P on the under face of the bar A and receives the nut e', as clearly shown in Figs. 1 and 2. By tightening the nut e the gratebar A and column C are drawn together upon the nipple H, forming a tight and perfect joint between said parts. The upper ends of the columns C are connected by the horizontal pipe or conduit D, that, together with the columns C, form the bridge-wall of the furnace.

The coupling between the pipe D and the columns C :is formed by the nipple H and tiebolt t, as shown in Figs. 1 and 2. this coupling the interior of the column is provided with a double or slotted lug u, located on a line with the opening leadingvfrom said column, in which the nipple His placed.,

The inner end of the bolt t is threaded, and provided with a rectangular nut e, said nut being set so that its narrow portion will pass between the divided lug a, but when turned will engage said lug on each side and rest upon the flange 0 thereof, (see Fig 2,) thereby locking said nut in place. Then by turning the bolt t, by means of a wrench applied to the head c thereof, said bolt maybe driven through said nut, thus drawing the parts together upon the nipple H, forming the joint. By this arrangement the threaded end of the bolt and nut care out of the lire-space, and the head c only of the bolt is exposed to the fire.

The outer end of the pipe D of the bridgewall is provided with the hollow double head K, to which the ends of the side bars B B are coupled, the joint being formed by the nipple, as described, in coupling the vertical column C to the pipe D, and the parts secured by the tie-bolts o', as shown in Figs. 1 and 4.

The forward ends of the sidebars B B are coupled, and the bar B coupled to the end of the mud-pipe E by the nipples H and tie-bolt m, as clearly shown in Fig. 4. This coupling is effected by placing anipple H between the bars B B and between the bar B and the upper face of the mud-pipe E and passing the To effect l IOO bolt m therethrough, the upper end of said bolt having a T-shaped head o, that is adapted to engage with the lug o located within the bar B. The lower end of said bolt passes through the pipe E and receives the nut o, whereby said parts are coupled and a communication established between the side bars B B and the mud-pipe E and between said bars and the grate-bars A as well, as all of said parts are hollow.

The induct-pipe f communicates with the chamber G of the mud-pipe E. The water is taken from the forward part of the boiler near the bottom, and flowing through the pipe f into the mud-drum E, passes through the hollow grate-bars, bridge-wall, and side bars, and through the educt-pipe f back to the boiler as steam.

Fig. 5 is an enlarged View of the nipplecoupling used in connecting the parts of the grate. The nipple H is provided at each end with the extended annular flange Z). Said ange is milled so as to snugly lill the orifice in the adjacent parts coupled, and to make the joint more secure asbestus and copper are placed around the periphery of the flange b against the annular shoulder d, as shown at s, and when the parts are drawn together by means of the tie-bolt the gasket so formed is compressed between the shoulder CZ of the nipple and the corresponding shoulder of the coupled parts, thereby making the joint doubly secure.

It will be seen that in making the coupling between the bars and the bridge-wall the nuts and threaded ends of the tie-bolts are out of the lire-space, and in making the coupling between the grate-bars A and columns C and between the side bars B B and the crosspipe E, no portion of the tie-bolts are in contact with the fire, thereby preventing the action of the heat from loosening said bolts and causing the joints to leak. It will also be seen that the grate-bars A are formed independent of the vertical columns of the bridge-wall, and that any one of them may be removed without effecting the other bars of the grate.

From the foregoing description it will be apparent that the water flowing through the hollow bars of the grate subjected to the intense heat of the furnace will be quickly converted into steam and returned to the boiler, thus utilizing a great portion of the furnace-heat that would otherwise be wasted, and eifecting a great saving in fuel.

It will be observed that the grate-bars are placed on a plane, so as to bring the rear ends above the front ends, the side bar B being lower at the front than at the rear end, while the bar B is higher at the front than at the rear end. By this construct-ion of parts the steam forming in the grate-bars and side bars is enabled to easily rise on its passage into the boiler of the furnace, and the steam generated in the columns C and horizontal coupling D finds escape upwardly through the side bar B into the boiler. The latter is not shown in the drawings, as such will be readily understood by those skilled in the art.

Having thus fully set forth my invention, what I claim, and desire to secure by Letters Patent, is

l. In combination with the hollow gratebars, the mud-pipe coupled near the forward ends thereof, the induct-pipe coupled to the head of said pipe, the hollow vertical columns coupled to the rear ends of the grate-bars, the hollow horizontal pipe D, coupled to the upper ends of the vert-ical columns and having a double head at one end,the hollowside bars B B, coupled to said head, and the hollow side bar B, con pled to the side bar B and to the mud-pipe, as and for the purposes specified.

2. In combination with the hollow gratebar having the nose on its under face, the hollow column C, having the slotted lug a within its chamber, the nipple coupling the grate-bar to the column, and the bolt h, its head engaging with the lug of the column, said bolt passing through the nipple and the nose of the grate-bar and having the nut on the lower end thereof, as and for the vpurposes specified.

3. In combination with the hollow gratebar, the hollow column C, coupled thereto, the hollow section D, coupled to the upper end of the column by means of che nipple H, and the .bolt t, passing through the section D and the nipple and having the nut e anchored in the hollow column C, with the head cof said bolt outside of and pressing the face of the section D, substantially as and for the purposes specified.

In testimony whereof I affix my signature in presence of two witnesses.

WILLIAM H. FARRIS.

Vitnesses:

E. S. WHEEER, B. F. WHEELER. 

